<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>文本</title>
    <style>
        .red {
            color: rgb(255, 64, 64);
        }
        
        .green {
            color: #00ff00
        }
        
        .blue {
            color: #00f;
        }
        
        .box {
            width: 200px;
            height: 200px;
            background-color: transparent;
            position: absolute;
            top: 0
        }
    </style>
</head>

<body>
    <!-- rgb
    red 0-255 grenn blue  3byte  1byte = 8bit  -->
    <p>
        <span class="red">红色</span>
        <span class="green">绿色</span>
        <span class="blue">蓝色</span>
    </p>
    <div class="box"></div>

</html>